Vehicle-brake.



2 $HEETSSHEET 1.

Patented Nov. 21, 1911.

J. A..Mc Grafch J A. MGGRATH. VEHICLE BRAKE.

APPLICATION FILED JULY 20.1910

QIlW/TA/ESSES:

J. A. MGGRATH.

VEHICLE BRAKE.

APPLIGATION FILED JULY 20,1910.

2 SHBETSSHEBT 2.

Patented Nov. 21, 1911.

. yum- N@ mm @m WITNESSES:

JOHN A. McGRA'lI-I, ST. LOUIS, MISSOURI.

VEHICLE-BRAKE.

ooaosi.

Application filed July 20, 1910. Serial No. 572,798.

To all whom it may concern. I 4

Be it known that I, JOHN A. MCGRATH, a citizen of the United States, residing at the city of St. Louis, Missouri. have invented a certain new and useful Vehicle-Brake, of which the following is such a full, clear, and exact description as will enable any one skilled in the art to which it appertains to.

the ground or rail on which the vehicle runs..

thus saving wear upon the wheels or tires of the vehicle.

Another object of my invention is to pro vide nyaans whereby the momentum of the wheelitself will supplement the operator of the, brake in exerting the force to operate the shoe.

Still another object of my invention is to so construct the brake that a portion or all of the weightof the vehicle may be transferred from the wheels to the shoes so that the vehicle may, if so desired, be raised entirely from the ground.

In the accompanying drawings which illustrate some forms of brake made in accordance with my invention Figure 1 is a top plan view showing my brake as applied to a motor vehicle; Fig. 2 isa'side view partly in section; Fig. 3 is a top plan view of one of the rear'wheels; Fig. 4 is a side elevation of one of the rear wheels some f the parts being shown in section; Fig. 5 is an enlarged detailview of the casing carrying the brake shoe; Fig. 6 is a rear view of the clamping shoe; and Fig. 7 is an enlarged sectional view of the hand brake.

Like marks of reference refer to similar parts in the several views in the drawings.

'15 represents the front wheels and 16 the rear wheels of a motor vehicle. Placed ad jacent to these wheels 15 and 16 are casings 17 carried from the axle of the vehicle by means of hangers 19. Pivoted'in each of the casings 17 is a lever 20 carrying at its lower end a roller 21. This roller 21 cooperates with a wedge-shaped projection 22 on the upper face of a shoe 23 which is pivoted at 24 to the casing 17. The lower face Specification of Letters Patent.

Patented Nov. 21, 1911.

of the shoe 23 is provided with teeth 25 which are adapted to make contact with the ground when the shoe 23 is forced through the opening26 in the lower face of the casing 17 by the operating of the lever 20. The lever 20 is held in its normal position by means of a coil spring 27. The shoe 23 is retracted by means of a rod 29 pivoted at one end to the said shoe and at the'other to the lever 20. In order to utilize the momentum of the vehicle itself in forcing the shoe 23 against thevground I secure to the lever 20 a clamping shoe 28, shown in detail in Figs. 5 and 6. This clamping shoe 28 is made wider at the bottom than at the top as best shown in Fig. 6, so that when it is forced against the tire of the wheel 16 the tire will be clamped in the shoe and consequently the shoe will be drawn upward and forward so as to transmit the power fromthe wheel 16 to the lever 20. The shoe 28 may be secured to the lever 20 by means of a solid-rod 30,-as shown in Fig. 2. I prefer, however. to secure the shoe to the lever by means of a pair of coil springs 31 as shown in Figs. .5 and 6 so as to lessen the shock caused by applying the brake.

In order to force the lower end of the shoe 28 toward the wheel 16 I prefer to form on said shoe a cam-shaped projection 32 as shown in Fig. 2 and to provide the casing 17 with a roller 33 which acts upon said cam-shapedprojection and thus forcesthe lower end of the shoe toward the wheel as it is drawn upward. The shoe 28 is made of comparatively light metal and is provided with a lining 34 of leather or-other suitable material to prevent injury to the tire of the wheel 16. In order to vary the vide the rear face of the said shoe with an adjusting rod 35 which is secured at its upper end to a projection 36 at the outer edge of the shoe. The lower end of the adjusting rod 35 passes through an opening in a lug 37 and is provided with a nut 38 by means of which the curvature of the shoe may be varied.

' In order that the casing 17 adjacent to the rear wheels may be swung away from the wheels to allow the removal and replacing of the tires I provide the hangers 19.

with knuckle joints 40. In order to hold the parts of the hanger 19 in their normal position a key or wedge 41 1s provided as v 65 hand side of the machine is prolonged into shown in Fig. 4. The hangers 19 carrying the casing 17 adjacent to the front, wheels 15 might also be provided with knuckle joints but as the wheels may be swung away from the casing by the usual steering gear this is not essential.

Attached to the upper end of each of the levers 20 adjacent to the .rear wheels is a cable 42. This cable 42 passes around. a sheave 43 which serves to hold the cable out of. contact with the axle of the rear wheel. This sheave 43 may be carried over the axle as shown in Fig. l or it may be carried from the hanger 19 as shown in Figs. 3 and 4. After passing around the sheave 43 the cable 42 is attached to an arm 44 projecting downwardly from a rock shaft 45 as best shown in Fig.2. This rock shaft 45 is provided between the arms 44 with an arm 46 to which is attached a cable 47. This cable 47 passes over a sheave 48 carried by the casing of the propeller shaft. After passing over the sheave 48 the cable 47 passes under a sheave 50 carried on the lower end of a plate 51 carried in the casing 52. This plate 51 is similar to the shoe 23 hereinbefore described, except that it is not provided with teeth. I

The upper face of the "platefil is provided with an arm 59 to-which is attached the end of the cable 47 The cable 47 passes forward from the sheave 50 and around a sheave 53 before passing to the arm 59. The plate 51 is operated by means of a pedal 54. This pedal 54 is preferably provided with a detent 55, cotiperating with a toothed track'56ijThe arm 59 has attached to it in addition'fth the cable 47 a second cable 57 which passes 'under the sheave 53 and thencearound a sheave .58 on the front axle. The end of the cable 57 is secured to the lever 20 of the casing 17 adjacent to the front wheel 15. In this way whenthe pedal 54 is operated the shoe 23' of the casing 17 adjacent to-both the-front and rear w eels will be forced downwardly by the action of the rollers 21.

In addition to the braking mechanism above described I prefer to'pro'vide the rear wheels 16 with drums 6O coiiperating with brake shoes 61, as shown in detail in Fig. 7. Each of these brake shoes 61 is provided near its forward end with an inclined projection 62 and near its rear end with an inclined projection 63. These projections are engaged by rollers 64 and 65 respectively carried by a cross bar 66. In order to op-- erate the shoes 61 each is provided at its forward end with an inclined projection 67 adapted to be engaged by a roller 68 carried on a lever 69. This lever .69 has attached to it a rod -or cable 7 O which extends to an arm 71 on a rockflshaft 72. One of these arms 71 preferably that at the right an operating lever 73 as best shown in Fig- 2. The upper end of this lever, is preferprefer also to provide the propeller shaft with a drum 76 cotiperating with a brake shoe 77 similar in construction to the brake shoes 61 hereinbefore described. In order to operate this brake shoe 77a cable 78 extends therefrom around a sheave 79 to an auxiliary pedal 80.

. Having fully described by invention, What I claim as new and desire to secure .by Letters Patent of the United States, is:

1. In a vehicle brake, the combination with the vehicle body and wheels, of a hollow casing carried by said body, a shoe pivotally mounted in said casing and adapted to bear against the wheel supporting surface, a pivoted-lever extending within said casing and having its end cotiperating with said shoe, and means for operating said lever.

2. In a vehicle brake, the combination with a vehicle body and wheels, of a hollow casing carried by said body, a shoe pivotally mounted in said casing, a pivoted lever extending in said casing and provided with an anti-friction roll codperating with said shoe toactuate the same,.and means for operating said'lever.

3. In a vehicle brake, the combination with the vehicle body and wheels, of a member carried by said body, a shoe pivotally mounted on said member so as to swing into and out of contact with the wheel supporting surface, a pivoted lever bearing onsaid shoe and adapted to move along the same toward and away from its pivot point, and a clamping shoe coiiperating with said shoe and-attached to said lever to actuate the same to apply said first-named shoe.

4. In a vehicle brake, the combination with the vehicle body and wheels, of a mem-' ber carried by said body, a shoe pivotally mounted to said member and adapted to bear against the wheel supporting surface,

a lever pivotally mounted to said member.

and provided with an anti-friction roll 00- operating with said shoe-to actuate the same, and a clamping shoe adapted to clamp the wheel and to operate said lever.

5. In a vehicle brake, the combination with the vehicle body and wheels, of a hollow casing carriedby said body, a shoe pivotally mounted within said casing and adapted to bear against the wheel supporting surface, a lever pivoted in said casing and coiiperating with said shoe, and a clamping shoe adapted to clamp the wheel and to operate said lever.

6. In .a vehicle brake, the combination with the vehicle body and wheels, of a member carried by said body, a shoe pivotally mounted in said member and provided on its lower face with teeth, a lever pivoted to said member and provided with an anti-friction roll cooperating withsaid shoe to actuate .the same, and a clamping shoe for clamping the wheel and operating said lever.

7. In a vehicle brake, the combination with a vehicle body and wheels, of a member carried by said body, of a shoe pivotally mounted on said member and adapted to bear against the wheel supporting surface,

a lever for actuating said shoe, a clamping shoe, and yielding connections between said clamping shoe and lever for actuating the latter.

8. In a vehicle brake, the combination with the vehicle body andwheels, of a member carried by said body, a shoe pivotally mounted on said member, a lever pivoted to said member and operating said shoe, a clamping shoe for operating said lever, and

adjusting means for varying the curvature of said clamping shoe.

9. In a vehicle brake, the combination with the vehicle body and wheels, of a hollow casing, a shoe pivotally mounted in said casing, a lever pivoted to said casing for operating said shoe, means for actuating said lever, a support for said casing, said support being provided with a joint" for swinging the casing away from the wheel.

10. In vehicle brake, the combination with the vehicle body and wheels, of a member carried by said body, a shoe pivotally mounted on said member, a lever pivoted to said member for operating .said shoe, a.

clamping shoe for operating said lever, said clamping shoe being provided at 1ts lower end with an inclined projection, an abutclined projection, an anti-friction roll carried by said member and forming an abutment cooperatingiwith said inclined projectior to 'force the shoe toward the wheel.

1?. In a vehicle brake, the combination with the vehicle body and wheels, of a hollow casing carried by said body, a shoe pivotally mounted within said casing, a pivoted lever extending within said casing and cooperating with said shoe, a clamping shoe for clamping the wheel and o crating said lever, the lower end of said 0 amping shoe being provided with an inclined projection, and an anti-friction roll carried by said casing and forming an abutment cooperating with said projection to force the shoe toward the wheel.

13. In a vehicle brake, the combination with the vehicle body and wheels, of a hollow casing carried by said body, a shoe. pivotally mounted within said casing and provided on its lower face with teeth, a pivoted lever extending into said casing and provided with an anti-friction roll cooperating with said shoe to actuate the same, and a clamping shoe for clamping the wheel and actuating said lever.

In testimony whereof, I have hereunto set myhand and affixed my seal in the presence of the two subscribing witnesses.

JOHN A. MCGRATH. [L. s]

Witnesses:

E. E. HUFFMAN, ELIZABETH BAILEY. 

